Electrical engineering technology

Author: Zhao Huijun
Publisher:
Publish Date: 2006-11-01
Features:
Chapter 1 DC Circuits
1.1 Circuit Models
1.1.1 The Function and Components of a Circuit
1.1.2 Circuit Models of Practical Circuits
1.2 Basic Physical Quantities of Circuits
1.2.1 Current
1.2.2 Voltage
1.2.3 Potential
1.2.4 Electromotive Force
1.2.5 Power
1.3 Rated Values of Electrical Devices and Circuit States
1.3.1 Rated Values of Electrical Devices
1.3.2 Circuit States
1.4 Basic Laws of Circuits
1.4.1 Ohm's Law
1.4.2 Kirchhoff's Laws
1.5 Voltage Sources, Current Sources, and Their Equivalent Transformations
1.5.1 Voltage Sources
1.5.2 Current Sources
1.5.3 Equivalent Transformation of Two Models of Practical Sources
1.5.4 Simplification of Active Branches
1.6 Series and Parallel Resistances
1.6.1 Series Resistance
1.6.2 Parallel Resistance
1.7 Branch Current Method
1.8 Superposition Theorem
1.9 Thevenin's Theorem
Summary of This Chapter
Exercises
Chapter 2 AC Circuits
2.1 Sinusoidal Quantities
2.1.1 Period, Frequency, and Angular Frequency
2.1.2 Instantaneous Value, Maximum Value, and Effective Value
2.1.3 Phase, Initial Phase, and Phase Difference
2.2 Phasor Representation of Sinusoidal Quantities
2.2.1 Complex Numbers
2.2.2 Phasor Representation of Sinusoidal Quantities
2.2.3 Phasor Diagram
2.3 AC Circuits with Single Parameters
2.3.1 AC Circuit with a Resistor
2.3.2 AC Circuit with an Inductor
2.3.3 AC Circuit with a Capacitor
2.4 AC Circuits with R, L, C Combinations
2.4.1 Series RLC AC Circuit
2.4.2 Parallel RLC AC Circuit
2.5 Power in AC Circuits
2.5.1 Instantaneous Power
2.5.2 Active Power
2.5.3 Reactive Power
2.5.4 Apparent Power
2.5.5 Power Factor Improvement
2.6 Resonance in AC Circuits
2.6.1 Series Resonance
2.6.2 Parallel Resonance
2.7 Phasor Method for Solving AC Circuits
2.7.1 Arithmetic Operations of Complex Numbers
2.7.2 Phasor Analysis of RLC Single-Parameter Circuits
2.7.3 Phasor Analysis of General AC Circuits
2.8 Three-Phase AC Power Sources
2.8.1 Three-Phase Symmetrical Voltage
2.8.2 Connection of Three-Phase Power Sources
2.9 Three-Phase Loads
2.9.1 Star Connection of Three-Phase Loads
2.9.2 Delta Connection of Three-Phase Loads
2.9.3 Phasor Analysis of Three-Phase Circuits
2.10 Power in Three-Phase Circuits
2.10.1 Relationship Between Total Power and Phase Power in Three-Phase Circuits
2.10.2 Power of Symmetrical Three-Phase Loads
Summary of This Chapter
Exercises
Chapter 3 Transient Processes in Circuits
3.1 Cause of Transient Processes and Switching Laws
3.1.1 Cause of Transient Processes
3.1.2 Switching Laws
3.2 Three-Element Method for Analyzing Transient Processes in First-Order Circuits
3.3 Charging and Discharging Processes in RC Circuits
3.3.1 Charging Process in RC Circuits
3.3.2 Discharging Process in RC Circuits
3.4 Transient Processes in RL Circuits
3.4.1 RL Circuit Connected to DC Voltage
3.4.2 Short Circuit of RL Circuit
3.4.3 Open Circuit of RL Circuit
Summary of This Chapter
Exercises
Chapter 4 Magnetic Circuits and Transformers
4.1 Basic Concepts and Physical Quantities of Magnetic Circuits
4.1.1 Basic Physical Quantities of Magnetic Circuits
4.1.2 Ohm's Law for Magnetic Circuits
4.2 Transformers
4.2.1 Purpose of Transformers
4.2.2 Basic Structure of Transformers
4.2.3 Basic Working Principle of Transformers
4.2.4 Use of Transformers
4.2.5 Classification of Transformers
4.3 Special Transformers
4.3.1 Autotransformers
4.3.2 Current Transformers
4.3.3 Rectifier Transformers
Summary of This Chapter
Exercises
Chapter 5 Motors
5.1 Types and Main Applications of Motors
5.2 Structure and Working Principle of Three-Phase Induction Motors
5.2.1 Structure of Three-Phase Induction Motors
5.2.2 Working Principle of Three-Phase Induction Motors
5.3 Electromagnetic Torque and Mechanical Characteristics of Three-Phase Induction Motors
5.3.1 Electromagnetic Torque of Three-Phase Induction Motors
5.3.2 Mechanical Characteristics of Three-Phase Induction Motors
5.4 Use of Three-Phase Induction Motors
5.4.1 Nameplate and Technical Data of Three-Phase Induction Motors
5.4.2 Starting of Three-Phase Induction Motors
5.4.3 Speed Control of Three-Phase Induction Motors
5.4.4 Braking of Three-Phase Induction Motors
5.5 Single-Phase Induction Motors
5.5.1 Structure and Working Principle of Single-Phase Induction Motors
5.5.2 Starting Methods
5.5.3 Application Examples of Single-Phase Induction Motors
5.6 Structure and Working Principle of DC Motors
5.6.1 Basic Structure of DC Motors
5.6.2 Working Principle of DC Motors
5.6.3 Nameplate and Classification of DC Motors
5.7 Use of DC Motors
5.7.1 Starting of DC Motors
5.7.2 Reversing of DC Motors
5.7.3 Speed Control of DC Motors
5.7.4 Braking of DC Motors
Summary of This Chapter
Exercises
Chapter 6 Relay-Contactor Control Systems and PLC
6.1 Common Low-Voltage Electrical Devices
6.1.1 Knife Switches
6.1.2 Combination Switches
6.1.3 Push Buttons
6.1.4 Air Circuit Breakers
6.1.5 Fuses
6.1.6 AC Contactor
6.1.7 Thermal Relays
6.1.8 Intermediate Relays
6.2 Rules for Drawing Electrical Schematics
6.2.1 Graphic and Letter Symbols of Electrical Components
6.2.2 Rules for Drawing Electrical Schematics
6.3 Basic Control Circuits for Three-Phase Induction Motors
6.3.1 Jogging Control
6.3.2 Start-Stop Control
6.3.3 Multi-Location Control Circuit
6.3.4 Forward-Reverse Control
6.4 Position Control
6.4.1 Limit Switches
6.4.2 Position Control
6.4.3 Automatic Reciprocal Position Control
6.5 Time Control
6.5.1 Time Relay
6.5.2 Star-Delta Starting of Motors
6.6 Structure and Working Principle of Programmable Logic Controllers (PLC)
6.6.1 Basic Structure of PLC
6.6.2 Basic Working Principle of PLC
6.7 Instruction System of PLC
6.7.1 Basic Instructions
6.7.2 Special Instructions
6.8 Basics and Applications of PLC Programming
6.8.1 PLC Programming Principles
6.8.2 Application Examples
Summary of This Chapter
Exercises
Chapter 7 Power Supply and Safe Use of Electricity
7.1 Overview of Power Generation, Transmission, and Distribution
7.1.1 Generation of Electricity
7.1.2 Composition of Power Systems
7.1.3 Factory Power Supply
7.2 Safe Use of Electricity
7.2.1 Harm of Current to the Human Body
7.2.2 Protective Measures Against Electric Shock
7.2.3 First Aid for Electric Shock
7.2.4 Practical Knowledge of Safe Use of Electricity
Summary of This Chapter
Exercises
Chapter 8 Basics of Electrical Measurement
8.1 Common Electrical Instruments
8.1.1 Classification and Surface Markings of Common Electrical Instruments
8.1.2 Composition and Working Principle of Electrical Instruments
8.2 Electrical Measurement Technology
8.2.1 Errors and Range Selection of Electrical Instruments
8.2.2 Measurement of Current
8.2.3 Measurement of Voltage
8.2.4 Measurement of Power
8.2.5 Energy Meter and Measurement of Electric Energy
8.3 Multimeters
8.3.1 Analog Multimeters
8.3.2 Digital Multimeters
8.4 Megohm Meters and Insulation Resistance Measurement
8.4.1 Working Principle of Megohm Meters
8.4.2 Measurement of Insulation Resistance
Summary of This Chapter
Exercises
Appendix: Introduction to Common Circuit Components—Resistors and Capacitors
Part of the Exercise Reference Answers
References